What does this mean - Small thyroid with diffusely heterogenous parenchyma?

"The thyroid parenchyma" is the main part of your thyroid gland. "Diffusely and markedly heterogeneous" means it's lumpy all over. Talk with your health care provider about what this means for your care, as you need to combine this imaging finding with the results of your history, physical exam, and lab work to assign any meaning.